Calcium propionate is an acid-type food preservative. Under acidic conditions, it produces free propionic acid, which has antibacterial effect. Its antibacterial effect is affected by the pH value of the environment, and the inhibitory effect on mold is the best when the pH value is 5.0.

Phosphate, the salt of phosphoric acid, is one of the natural components of almost all foods, and is widely used in food processing as an important food ingredient and functional additive. What are Phosphates? The naturally occurring phosphate is phosphate rock (containing calcium phosphate).

Food preservatives are a type of food additives that prevent food spoilage due to the action of microorganisms and prolong the shelf life of food. Its anti-corrosion mechanism is mainly to reduce the water activity of the product, reduce the PH of the product, act on the specific structural parts of the microorganism, destroy the growth of the microorganism or the normal progress of the metabolic system, thereby inhibiting the growth of the microorganism and prolonging the shelf life of the product.

sodium tripolyphosphate is neutralized by phosphoric acid into sodium orthophosphate by soda ash, and then condensed. There are two methods of producing phosphoric acid, wet method and thermal method.